Being able to measure ducted airflow cheaply and non-intrusively, like with this ultrasonic flow meter, could be a big deal for DIY projects and the trades in general. The principle behind the ...

The ultrasonic technology enables 4-in-1 combined sensor operation ... The Gasboard-8500FS-X200 has a flow rate in the range of 240 L/minute. The system has been designed to have ultrasonic ...